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Light Year
How can scientists mesure the distances of a light year of Stars in the others galaxies ?
"A light year is the distance that light will travel in a year. Light travels at 186,000 miles per second."
the light year distance when comes from far in another galaxie. How to know that is 200 light years or other?
How much time needs the sun light from the crown to reach earth? Thank you.
I presume your question is about determining distances to stars, and galaxies.
For relatively near stars, the parallax method is used, where the orbit of the Earth around the Sun, with observations done 6 months apart, will create a very small, but still measurable, apparent motion of nearby stars against a much more distant background.
For more distant stars, the spectral type to luminosity relationship is used. Since the stellar theory provides a relation between stellar type (the color of the star) and how bright it is in absolute term, how bright it appears as seen from here is thus a function of how far away the star is.
For galaxies, yet another couple of techniques are used. One uses the variables stars, the brightness of which is a function of the absolute luminosity; and another one uses supernova, again, theory shows how bright they should be. Of course, this requires a supernova to be observed.
Finally, there is the Doppler effect, as galaxies are usually moving away from one another in the expansion of the universe, the speed a galaxy is moving away from us correlates with how far it is; see about the Hubble constant for more details.
The Earth is 8.3 light minutes from the Sun, these 8.3 minutes is how much time it takes for the light from the Sun to reach us.
Light Years E=mc2
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